As Figure 2 illustrates, the intensity of solar radiation above 1,200 nm is relatively small
and falls rapidly as wavelength increases (the top line represents global irradiance).
Figure 2. Standard solar spectrum (ASTM E891, E892; as cited in “Solar radiation basics,”
2002). The solid and dotted lines represent total and direct irradiance, respectively.
Experimental setup
The experiment was performed outdoors at UMTRI. The car remained stationary, facing
southwest, throughout the duration of the experiment. The car’s roof, windshield, rear window,
and passenger-side front and back windows were covered with aluminum foil (see Figure 3) in
order to better control the cabin air temperature and to eliminate the possibility of solar radiation
hitting the driver from multiple angles. One pyranometer sensor was mounted in on the car’s
roof (level to gravity).
As Figure 2 illustrates, the intensity of solar radiation above 1,200 nm is relatively small
and falls rapidly as wavelength increases (the top line represents global irradiance).
Figure 2. Standard solar spectrum (ASTM E891, E892; as cited in “Solar radiation basics,”
2002). The solid and dotted lines represent total and direct irradiance, respectively.
Experimental setup
The experiment was performed outdoors at UMTRI. The car remained stationary, facing
southwest, throughout the duration of the experiment. The car’s roof, windshield, rear window,
and passenger-side front and back windows were covered with aluminum foil (see Figure 3) in
order to better control the cabin air temperature and to eliminate the possibility of solar radiation
hitting the driver from multiple angles. One pyranometer sensor was mounted in on the car’s
roof (level to gravity).
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